US4031292A
Expired / Lapsed
US
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Method for the preparation of an electrocatalyst
Assignee: Honeywell UOP LLC
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Filing: 1976-04-19
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Granted: 1977-06-21
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Expires: 1996-04-19
Abstract
Abstract Electrocatalysts which may be used in the preparation of electrodes for electrochemical cells such as fuel cells comprising a refractory inorganic oxide having a carbonaceous pyropolymer forming at least a monolayer on the refractory oxide, the surface of said pyropolymer having at least one catalytically active metal impregnated thereon may be prepared by treating a refractory inorganic oxide with a pyrolyzable organic compound to form at least a monolayer of a carbonaceous pyropolymer on the surface of said refractory inorganic oxide, thereafter impregnating the resulting composite with a complex of a soluble salt of at least one catalytically active metal and a sulfur-containing carboxylic acid, heating the impregnated composite to remove the solvent, reducing the dried composite and thereafter recovering the resultant electrocatalyst.
Inventors
- 👤 George L. Hervert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:51
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/024; H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
86 words
A method for the preparation of an electrocatalyst which comprises treating a refractory inorganic oxide with a pyrolyzable organic compound at pyrolysis conditions to form at least a monolayer of a carbonaceous pyropolymer on the surface of said refractory inorganic oxide, thereafter impregnating the resulting composite with a complex of a soluble salt of at least one catalytically active metal and a sulfur-containing carboxylic acid, heating the impregnated composite to a temperature sufficient to remove the solvent, reducing the dried composite and recovering the resultant electrocatalyst.
Claim 2
Independent Claim
86 words
A method for the preparation of an electrocatalyst which comprises treating a refractory inorganic oxide with a pyrolyzable organic compound at pyrolysis conditions to form at least a monolayer of a carbonaceous pyropolymer on the surface of said refractory inorganic oxide, thereafter impregnating the resulting composite with a complex of a soluble salt of at least one catalytically active metal and a sulfur-containing carboxylic acid, heating the impregnated composite to a temperature sufficient to remove the solvent, reducing the dried composite and recovering the resultant electrocatalyst.
Claim 3
Dependent Claim
30 words
The method as set forth in claim 1, in which said pyrolysis conditions include a temperature in range of from about 400° to about 1200° C. in a reducing atmosphere.
Claim 4
Dependent Claim
29 words
The method as set forth in claim 1 in which said temperature sufficient to remove the solvent is in a range of from about 100° to about 250° C.
Claim 5
Dependent Claim
34 words
The method as set forth in claim 1, in which the dried composite is reduced in the presence of hydrogen at a temperature in the range of from about 100° to about 600° C.
Claim 6
Dependent Claim
17 words
The method as set forth in claim 1 in which said refractory inorganic oxide is an alumina.
Claim 7
Dependent Claim
14 words
The method as set forth in claim 5 in which said alumina is gamma-alumina.
Claim 8
Dependent Claim
16 words
The method as set forth in claim 1 in which said catalytically active metal is platinum.
Claim 9
Dependent Claim
16 words
The method as set forth in claim 1, in which said catalytically active metal is palladium.
Claim 10
Dependent Claim
21 words
The method as set forth in claim 1 in which said catalytically active metal is a mixture of platinum and rhenium.
Claim 11
Dependent Claim
21 words
The method as set forth in claim 1 in which said catalytically active metal is a mixture of platinum and rhodium.
Claim 12
Dependent Claim
17 words
The method as set forth in claim 1 in which said sulfur-containing carboxylic acid is thiomalic acid.
Claim 13
Dependent Claim
17 words
The method as set forth in claim 1, in which said sulfur-containing carboxylic acid is thioglycolic acid.
Claim 14
Dependent Claim
17 words
The method as set forth in claim 1, in which said sulfur-containing carboxylic acid is mercaptoacetic acid.
Claim 15
Dependent Claim
17 words
The method as set forth in claim 1, in which said sulfur-containing carboxylic acid is mercaptopropionic acid.
Claim 16
Dependent Claim
17 words
The method as set forth in claim 1, in which said sulfur-containing carboxylic acid is mercaptopbutyric acid.
References Cited (Backward Citations)
US3881957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |